Cesspool building and servicing facilities are available in Rome. A cesspool or a cesspit is a tank or a cistern used to dispose of urine and feces, along with other sewage and waste products. When the solid materials settle to the bottom of the cesspool, they are digested by anaerobic bacteria. The water filters out into the soil using openings built into it. They are essentially rudimentary septic systems, comprising a concrete-capped pit lined with cinder blocks laid on their sides with perforated drain field piping below the intake level. It is vulnerable to flooding, or entry of tree roots. Over a period of time, greases, oils, soap scum, small solid particles adhere to the walls of the cesspools, interfering with passage of water. This can be serviced in Romewith unclogging solutions and digestants to help the water to move again. These formulations contain bacteria and bacterial enzymes that help break down the gunk and clean up the sides of the walls.